Camera-front.



2 SHEETS-SHEET 1.

Patented- Apr. 6, 1915;

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CAMERA FRONT.

APPLICATION man Nov. 1.1912.

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W. F. FOLMER.

CAMERA FRONT.

' APPucAYTlou man nov. 1. 1912.

Patented Apr. 6

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WILLIAM F. FOLMEB, OF ROCHESTER, NEW YORK, ASSIGNOR T0 EASTMAN KODAK COMPANY, OF ROCHESTER, NEW`YORK, A CORPORATION OF NEW YORK.

CAMERA-FRONT.

Specication of Letters *Patent Patented Apr. 6, 1915.

Application led November 1, 1912. Serial No. 729,066.

To 'all whom it may concern Beit known that I, WILLIAM F. Femme, of Rochester, in the county of Monroe and State of New York, have invented certain lnew and useful Improvements in Camera- Fronts; and I do hereby declare the follow- Iingto be a full, clear, and exact description ofthe same, reference being had tothe ac- -companying drawings, forming a part of vthis specification, and to the reference-numerals marked thereon.

My present invention relates to photog Vraphy and more particularly. to photographic cameras, and it has for its object to' mprove the adjusting mechanism for raisingorlowering a camera front or lens carrymg member.

A further yobject of the inventlon. 1s to so .regulate the travel of the front during such adjustment that they image .reiiected by the .lens Awill be cast upon the plate or focal .plane of the camera to the best advantage and the bellows will be subjected to no unnecessary distortion.

.To these and other ends the invention consists in certain improvements and comb1- nations of parts all as will be vhereinafter more fully described, the novel features beclaims at the end of Tthespecification.'.

. fIn-thedrawings: Figure 1 is aside elevation df a camera constructed in accordance with anddllustrating one embodiment of my invention, the side of the box or body being broken away to reveal inner parts and the front being in'normal position; Fig. 2 is a similar fragmentary view with the front @rojectedfto a greater extent and adjusted to laraised position; Fig. 3 is a detail section .taken'substantially on the line 3 3 of Fig. l'showing the guiding arrangements for the @extensible support for the front; Fig. 4 is a horizontal section through the camera when closed taken substantially on the line 4 4 of fFig. 1; Fig. 5 is a front elevation of the rfrontand its support detached, and Fig.' 6 lis fa vertical section through the adjusting mechanism of the front taken substantially onzthe line 6-6 of Fig. 1. f.

'Similar reference numeralsthroughout the :several vv'figures' indicate the same parts.

chamber 4 that receives the front 5 when the camera is folded and also houses the bellows 6 connecting the front and body, the rear end of the bellows being secured at` the rear 7 of the chamber 4, but in front of the exposure chamber proper of the camera, a relativelyy short bell'ows being employed.

The front 5 is supported in the present instance on a pair of parallel vertically disposed rack bars 8 having their outer sides disposed against the respective side walls of the boX 1 and preferably received within channels- 9 cut therein', while the opposite or inner sides are 4providedr with parallel grooves 10 that receive inwardly turned flanges 11 on plates 12 secured to the walls and overlapping the bars izo-constitute tracks upon which the bars slide and between-which and the respective adjacent walls of the box lthey are confined. The lower edges of the bars are provided 'with..gear teeth 13 with which coperate pinions'14'on`a'shaf-t.15r

disposed transversely of and journaled in the box or body 1 so that-the supports may be projected and retracted and with them the front 5.

The front hitherto referred to generally by reference numeral 5 comprises a frame having seats 16 and 17 therein adapted to receive large or small lens boards in the cen ter of which the lens is carried, but a lens is not illustrated herein, the customary blank board 18 being shown in the seat 17. The upper rail 19 of the said front frame and bothof the side rails 20 are hollow, the former to receive a transversely extending drive shaft 21 (shown in dotted lines in Fig. 5) having an eXteriorly arranged operating knob 22 and the latter to receive vertically disposed lead screws 23 geared with the shaft 21 at 24'and adapted to be driven thereby. The side rails are further pro vided with lateral slots 25 into which project nuts 26 vswiveled .at 27 in standards 28 on the front ends of the respective .rackbar supports 8. Thus it will be seen that as the 'shaft 21 is rotated, the lead screws 23will raise or lower on the nuts 26' and carry with them the front frame in which the' lead screws are journaled. These movements of the front, however, are' controlled by a pair ofradius arm's 29 arranged on opposite'sides of the bellows 6 above the supports 8, each of which arms'is rigidly connected at its ,outer or forward end to a side rail 20 of the `fron`t,`while its inner or'rear end is pivoted at 30 to a standard 3l rising from the rear end of the'adjacent rack barv 8. The front,

therefor, init'srising and falling movements, swings about therearwardly'dlsposed center 30 and it is for this reason that the slots 25 are made' segmental, as shown, and the nuts 26 are4 swiveled on the standards 28.A 'The slot 25 may be formed in each instance, as shown, in a plate'32 constituting a part of the wall of a side rail 20 and integral with the adj acent'radius arm 29, and in order to define the normalposition of the front, I prefer to provide a notch 33 in the plate with which coperates a spring plate 34 having a knife edge 35, the said plate 34 being secured to the standard 28.

Thevmain purpose of this construction is to obtain a mode'of operation whereby the' lens in its movements of vertlcal adjustment will swing about a center, the position ofV which is as near as is practicable to the focal tion.

plane and'to the center point ofthe sensitized surface in that plane so that the axial rays of the lens will strike substantially in the centerof the plate just as they do when` the' front. is in normal position. -In other words, the optical axis of the lens will at all times approximate alinement with the geometrical axis of the sensitized surface and the image as a whole will hence be properly centered thereon. The ybroad purpose of a` rising and falling front is too well known in the art to merit explanation here, It will also be observed that the bellows yields from the same center which is in rear of its rear end during the'movements .of the front and subjected to greatly reduced'distor-v hence is I claim as my invention: 1. In aicamera, the combmation with a box or body, a front andan extensible s upport for the latter relatively to which the front is" adapte-'d to be raised and lowered, of a rearwardly extending radius arm connecte'd to the' front at one end andhaving its other end pivoted toa rearward extension of the support. v 2. In a camera, the combination with a box or body, afront, a bellows connecting -said parts, an extensible support for the front comprising a' pair of laterally arranged rack bars between which the frontis L ,adapted to `be adjusted vertically and driving means on the body coperating with the rack bars to cause their projection or retraction, of a pair of radius arms connected to the frontat their forward ends and having their rearward ends pivoted at rearward points vto` the respective rack bars so that said arms lie on opposite sides of the bellows. p. j

`3. In-a camera, the combination with'a box or body, a front' and a support for the latter relatively to which the front isadapted to beadjusted to raised .or lowered posi-v tions, ofan adjusting means for thefront' comprising ar vertical lead screw on one part and a swiveled nut on the other 4cooperating therewith,and a rearwardly extending radius arm connefted to the front and pivoted to one of said irst mentioned partsat a rear-v wardpoint. l ".1

LLIn` a camera, `the 4combination with a box or body, a front comprising a frame having a hollow `side rail provided with aj segmental slot and a support for the front relativelyvto which the latter is adapted'to be adjusted to` raised-or lowered positions,

of an adjusting means-for the `front comprising a swiveled nut on `the support projectingthrough 'thesegmental slot into the hollow yside rail of the front and.v a lead screw arranged in said hollow side yrail and cooperating with' the nut, and a rearwardly extending radius bar connected rigidly to the frontl and kpivoted at a rearward point to one of said first mentioned parts.

5. In a camera, the combination with a support and a front adjustable,4 vertically thereon and comprising a frame having a hollow side rail provided with av lateral slot,

of an adjusting means for the front Acomprising a lead screw`arranged in the hollow rail and a'nut on thesupport projectingthrough the slot in said rail and cooperating" with the lead screw.4 l

v 6. `In a camera, the combination with a thereon' and comprising a framel having hollow"` top and side rails, the latter provided lsupport, and a front adjustable vertically with'laterally opening slots, ofan adjusting means for the front comprising a lead screw arranged in each side Ira1l, a drive' .shaft arranged in the top rail and 'geared `vsv'th with an exteriorly arranged operating member, and nuts on the' support extending through the slots in the side rails -into cooperation with the lead screws.

7. In a camera,l the combination with a box or body havinga wall provided with a guidingrecess within the body and a front,

129 theflead screws, said shaft being provided f y 1,184,522 l f f 3 of an extensible` support for the latter emthe bar and provided -lwitlgl inwardly turned lbodjying a vertically disposed and relatively flanges coperating with .the grooves. .Het bar havin one side guided in the recess WILLIAM F. FOLMER.

of the wall o the body and provided with Witnesses:

IOngitudinal grooves in the ,other or outer RUSSELL B.. Gmm'rm side and plates on the said wall overlapping H. E. SToNEBRAKEiz; 

